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The United States military aero engine designation system was introduced in 1926, originally for piston engines it was expanded in the 1947 to include a separate system for turbine and rocket engines. ==Piston engines== A piston engine designation has three separate elements, a type prefix, a number representing engine displacement and a model number. ;Type Prefix :The type prefix is based on the engine disposition: Some early engines had the type letter prefixed by a modification letter *G - geared *I - inverted *S - supercharged ;Displacement :A number related to the engine displacement within 5 cubic inches. ;Model Suffix Letters were used between 1926 and 1933 then suffixes were numerals with odd number for Army and later Air Force engines and even numbers for Navy engines. After 1943 the letters AN were included to indicate the engine met both Army/Air Force and Navy requirements. Some engines fitted with water-injected engines had the W added to the suffix. For example the Curtiss V-1150-1 is a Vee-type engine with a displacement of 1150 cubic inches and is an Army model. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「United States military aero engine designations」の詳細全文を読む スポンサード リンク
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